Popular Canadian DIY and engineering YouTuber AvE is deep into explaining the work of a fixed displacement oil pump when his young daughter comes into the shop. The two minutes starting at 4:30 are cute enough to melt the coldest heart as he kisses her booboo ("ouch ouch") and explains what he's doing.
Yeah, you're welcome to watch all ten minutes of engineering if you like. Those who follow his channel says AvE makes anything interesting and easy to follow. -via reddit